Malicious PDF — malware analysis report

Static analysis result for SHA-256 65dda30b788316fe…

MALICIOUS

PDF

41.2 KB Created: 2020-04-11 11:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 03d2f005e1422aa61b7ff94f908b50a0 SHA-1: 038ad509d788670c80afdeaf67813144eb9bbc82 SHA-256: 65dda30b788316fe9395654cb6167a38a1278fa9d3b859e256054074b05efc1f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, a common tactic for SEO poisoning or redirecting users to malicious sites. One prominent link points to a suspicious HTML page with a Russian query string, suggesting a potential phishing or malware distribution lure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://nobuhotelmarbella.devsite-1.com/uploads/1/3/0/5/130544321/130544321.html#%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%BA%D0%BB%D0%B8%D0%BF+%D1%8D%D1%82%D0%BE+%D0%B2%D1%81%D0%B5+%D0%BE%D0%BD%D0%B0+%D0%B8%D0%B4%D0%B5%D0%B0%D0%BB%D1%8C%D0%BD%D0%BE%D0%B3%D0%BE
    • http://www.creativelifesa.com/uploads/1/3/0/7/130776096/d4ac503896.pdf
    • http://girthydawg.com/uploads/1/3/0/6/130639895/1d74aa400f.pdf
    • http://ipaintdfw.com/uploads/1/3/1/4/131410299/lusiporinodago.pdf
    • http://cobton.nu/uploads/1/3/0/7/130740489/1dd00c4c3e450f.pdf
    • http://virtualautoandtrucksales.com/uploads/1/3/1/3/131380297/07da204701.pdf
    • http://yulebacreekstockhorses.com/uploads/1/3/1/3/131381682/1375028.pdf
    • http://sbpromogroup.com/uploads/1/3/0/8/130814805/1e0cc8bd9d.pdf
    • http://shipsimsglobal.com/uploads/1/3/0/2/130270997/c89c782d.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006eec.bin
bb0aaa3ed393ea4660bbb30aaedfede167f1f60b87bed09e478327ebef973494		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EEC 11812 bytes

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